Headphone



FIG. 1 is a top view of the headphone.

FIG. 2 is a bottom view thereof.

FIG. 3 is a side view thereof.

FIG. 4 is another side view thereof.

FIG. 5 is a perspective view thereof.

FIG. 6 is a back view thereof; and,

FIG. 7 is a front view thereof.

The broken lines form no part of the claimed design. 

The ornamental design for headphone, as shown and described. 